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This paper present a modified modulation strategy based on a triangular carrier wave for the three-level neutral-point-clamped (NPC) voltage source inverter (VSI). The switch states of each leg are determined by comparison between the modulation signals and a triangular carrier wave, which is used only of one triangular carrier wave for generate the gating pulses in three-level NPC VSI. The feasibility of the proposed modulation technique is verified by simulation and experimental results. These results show that a proposed carrier-based PWM technique can be easily implemented are provided to verify the proposed modulation strategy.